This is the source code for a website that lets you generate CSS code to set a property's value based on the viewport width. It essentially helps you do what's described in Modern Fluid Typography Using CSS Clamp, Linearly Scale font-size with CSS clamp() Based on the Viewport and Between the Lines.
You must, but doing it manually is extra work. If you wanted to have a 12px font size on a 280px screen, a 16px font size on a 768px screen, and all sizes inbetween, you'd have to manually create a linear function that goes through both points. This website can do that for you.
Here is an example of the font size being determined by two breakpoints. The stripes denote the area between the breakpoints, where the interpolation happens.
Although it may be simple to manually make a function such as the one specified above, you may sometimes require more than two points. We call such point a breakpoint (a viewport size and an associated size), and this website lets you specify way more than two of them. Take the following table as an example.
| Viewport size | Font size |
|---|---|
| 280px | 12px |
| 320px | 10px |
| 480px | 24px |
| 640px | 28px |
| 768px | 16px |
Given the above breakpoints, this website generates the following code which goes through all of them.
font-size: min(12px, 26px + -5vw);
@media screen and (min-width: 320px) {
font-size: calc(-18px + 8.75vw);
}
@media screen and (min-width: 480px) {
font-size: calc(12px + 2.5vw);
}
@media screen and (min-width: 640px) {
font-size: max(16px, 88px + -9.38vw);
}